DISTILLATION OF STTTMPWOOD. 



63 



dicating that the pinene present is laevo-alpha-pinene. Subsequent 

 fractions showed dextro-rotations, in a continually advancing degree. 

 The extra high density of the first distillate to come over is to be 

 attributed to the presence of traces of water, held in solution by 

 small quantities of methyl alcohol, known to occur in this portion of 

 refined turpentine recovered from crude second turpentine, and also 

 partly to the presence of the alpha-pinene. As the distillation pro- 



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Fig. 7. — Refractive index of distillate. 



gresses the specific gravity of the distillate slowly rises with the boil- 

 ing point to where, at about 20 per cent of total distillate, the presence 

 of a body having a specific gravity lower than that of the distillate 

 immediately preceding it again asserts itself by a bending back- 

 ward of the specific-gravity curve at this point. This may be due to 

 the presence of one or more of several bodies, the most probable 

 of which is limonene or dipentene (specific gravity 0.845, refractive 



